A 43-year-old man was referred to our hospital with a bladder tumor, which was incidentally found by abdominal ultrasonography in a health examination. Cystoscopy and magnetic resonance imaging showed a 3 cm submucosal bladder tumor localized at the top of the bladder. We performed transurethral resection of bladder tumor. Histopathological features was inflammatory tumor of urinary bladder. No local recurrence was seen 6 months after surgery.